JP2009221896A - Tank mounting structure of fuel pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tank mounting structure of a fuel pump, which reduces a cost while maintaining excellent attachability/detachability of a fuel pump unit. <P>SOLUTION: A fuel pump 52 includes at its top, a flange part 122 the part of which housed in a recess 111. A centering enlarged diameter part 134 is formed in the lower side surface 122s of the flange part 122. A plurality of pawl parts 137 are arranged on lower parts of a side face of the centering enlarged diameter part 134 and the other side face opposite to the side face, and which are engaged with edges of the pump mounting hole 112, and include a stepped surface 136 one step lower than the upper surface 134u of the centering enlarged diameter part 134. The top of the flange part 122 is provided with a flange foot part 127 for holding the top of the fuel tank 51 with the stepped surface 136. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement in a fuel pump tank mounting structure.

2. Description of the Related Art A fuel pump tank mounting structure in which a fuel pump is mounted on the upper surface of a fuel tank is known (for example, see Patent Document 1).
JP 2007-127003 A (FIG. 4)

  In FIG. 4 of Patent Document 1, the lid portion 13 of the fuel pump unit 10 is fitted into the opening 6 provided in the upper member 2 of the fuel tank (the reference numeral is the same as that of the same publication). The base 7 having the stepped portion 50 is welded, the guide member 8 is welded to the upper surface of the base 7, and after the fuel pump unit 10 is accommodated in the opening 6, the retainer 20 is inserted between the base 7 and the guide member 8. By inserting, the fuel pump unit 10 is attached to the fuel tank.

  In the technique of Patent Document 1, the base 7 and the guide member 8 are provided on the upper surface of the fuel tank, and the retainer 20 for fixing is provided so that the fuel pump unit 10 can be easily attached to and detached from the fuel tank. It is.

However, since the base 7, the guide member 8, and the retainer 20 are provided in order to make the fuel pump unit 10 easily detachable, the number of parts may increase, leading to an increase in cost.
A fuel pump tank mounting structure that can reduce the cost while maintaining good detachability of the fuel pump unit 10 is desired.

  An object of the present invention is to provide a fuel pump tank mounting structure that can reduce the cost while maintaining good detachability of the fuel pump unit.

  According to the first aspect of the present invention, a recess is provided in the upper part of a fuel tank that stores fuel, a pump mounting hole is provided in the bottom surface of the recess, a fuel pump is inserted into the pump mounting hole, and the fuel pump is connected to the fuel tank. In the fuel pump tank mounting structure, the fuel pump is provided with a flange portion that is partially accommodated in the recess at the top, and a seal is formed on a side surface below the flange portion in parallel with the flange portion. A seal seat for supporting the member is provided, and the seal member is provided on the upper surface of the seal seat between the side surface of the recess and the side surface of the fuel pump. The fuel pump is provided on the side surface below the flange portion. A centering enlarged diameter portion is formed so as to align with the center of the pump mounting hole. The centering enlarged diameter portion engages with the edge of the pump mounting hole below one side surface and the opposite side surface thereof. A plurality of claw portions having a stepped surface that is one step lower than the upper surface of the ring enlarged diameter portion is provided, and a flange foot portion that sandwiches the upper portion of the fuel tank between the stepped surface and the flange portion is provided. It is characterized by being.

  When attaching the fuel pump to the fuel tank, first, face the edge of the pump mounting hole to the groove on the upper side of the claw on one side of the centering diameter expansion part, and slide it sideways while pushing the fuel pump from above to move the claw on the opposite side. The edge of the pump mounting hole is made to face the groove part above the part. That is, the fuel pump is inserted into the pump mounting hole so that the upper part of the centering enlarged diameter portion formed in the fuel pump is fitted to the edge of the pump mounting hole. Next, while pressing the fuel pump from above, the edge of the pump mounting hole is engaged with one side surface of the centering enlarged diameter portion and stepped surfaces of a plurality of claw portions provided below the opposite side surface.

  Finally, release the pressure on the fuel pump from above. Then, the fuel pump is accurately aligned by the centering enlarged diameter portion and the claw portion, and is biased upward by the elastic force of the flange foot portion. That is, the fuel pump is sandwiched between the stepped surface and the flange foot and is securely held at a predetermined position.

Further, when removing the fuel pump from the fuel tank, the fuel pump is pressed from above, and the engagement between the edge of the pump mounting hole and the stepped surface is released. Next, with the fuel pump pressed, the fuel pump is moved in a direction parallel to the claw portion, and the claw portion provided on one side surface or the opposite side surface is removed from the edge of the pump mounting hole.
Finally, removal is completed by removing the claw portions provided on the side surface on the remaining side and lifting the fuel pump.

  The invention according to claim 2 is characterized in that the seal member is formed in a substantially U shape with a cross section opened downward.

  The invention according to claim 3 is characterized in that the plurality of claw portions are all extended in parallel in one direction, and the side surfaces of the claw portions are provided in parallel with the axial direction of the pump mounting hole.

  In the invention according to claim 1, the fuel pump is provided with a flange portion that is partially accommodated in the recess, and a seal seat is provided on a side surface below the flange portion. A sealing member is provided, and a centering enlarged diameter portion is formed on the lower side surface of the flange portion, and engages with the edge of the pump mounting hole below one side surface of the centering enlarged diameter portion and the opposite side surface thereof. A plurality of claw portions having a stepped surface are provided, and a flange leg portion that sandwiches the upper portion of the fuel tank with the stepped surface is provided at an upper portion of the flange portion.

  Since the fuel pump is integrally provided with a plurality of claw portions and flange feet having a stepped surface that engages with the pump mounting hole, the fuel pump can be mounted and removed without increasing the number of parts. Sex can be maintained. That is, the cost can be reduced while maintaining good detachability of the fuel pump unit.

  In the invention which concerns on Claim 2, the sealing member is formed in the substantially U shape by which the cross section was open | released below. If the seal member is an O-ring having a circular cross section, there is a limit to the crushing allowance of the O-ring, and it is difficult to compress and deform the seal member during attachment, removal, and centering, which affects workability.

  In this regard, if the seal member has a U-shaped cross section that opens downward, the crushing allowance can be sufficiently taken, the compression deformation is facilitated, and the workability is improved when the fuel pump is attached, removed, or centered.

  In the invention according to claim 3, the plurality of claw portions are all extended in parallel to one direction, and the side surfaces of the claw portions are provided in parallel to the axial direction of the pump mounting hole. If the side surface of the claw portion is provided parallel to the axial direction of the pump mounting hole, the plurality of claw portions can be smoothly attached and detached collectively by moving the fuel pump in the one direction.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In the figure, “front”, “rear”, “upper”, “lower”, “left”, and “right” indicate directions viewed from the driver. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a motorcycle according to the present invention. A motorcycle 10 includes a body frame 11, an engine 12 as a drive source suspended on the body frame 11, and a front portion of the body frame 11. A front wheel 13 that is attached, a steering wheel 14 that can steer the front wheel 13, and a rear wheel 15 that is attached to the rear of the vehicle body frame 11 and is driven by the engine 12 are provided.

  The vehicle body frame 11 is attached to a head pipe 17 constituting a front end portion thereof, a front fork 18 attached to the head pipe 17 so as to be steerable, and an upper end of a steering shaft 19 included in the front fork 18. A steering handle 14, a main frame 21 extending rearward and downward from the head pipe 17, and seat rails 22L and 22R extending rearward and upward from the rear left and right of the main frame 21 (only the reference numeral 22L on the front side of the figure is shown. ), A pivot plate 23 extending downward from the rear end portion of the main frame 21, and sub-frames 24L and 24R extending obliquely rearward and upward from the intermediate portion of the pivot plate 23 and connected to the intermediate portions of the seat rails 22L and 22R (see FIG. Only the reference numeral 24L on the front side is shown. And then, extended swing arm 26 rearward from the pivot shaft 25 provided on the pivot plate 23.

  The front wheel 13 is supported on the lower end portion of the front fork 18 via the front wheel axle 27, the rear wheel 15 is supported on the rear portion of the swing arm 26 via the rear wheel axle 28, and the rear portion of the swing arm 26 and the seat rail 22L. , 22R are attached rear cushions 29 and 29 (only the reference numeral 29 on the front side of the figure, the same applies hereinafter) that absorbs vibrations received from the ground while the rear wheel 15 travels.

  The engine 12 extends substantially horizontally in the front-rear direction in a side view, and a transmission 33 is integrally provided at the rear. The engine 12 is suspended from an engine stay 31 and a pivot plate 23 that are suspended from an intermediate portion of the main frame 21. ing. The engine 12 includes a transmission 33, and a drive sprocket 34 is attached to an output shaft 33 a of the transmission 33, and the drive sprocket 34 and a driven sprocket 35 attached integrally to the rear wheel 15. A chain 36 is passed between them.

The intake device 38 includes an intake pipe 43 connected to an upper portion of a cylinder head 42 constituting the cylinder portion 41, a fuel supply device 53 connected to the intake pipe 43, and a connecting tube (not connected) to the fuel supply device 53. The air cleaner 44 is connected to the main frame 21 through an air cleaner 44 connected via the main body 21.
The exhaust device 45 includes an exhaust pipe 46 having a front end connected to the lower portion of the cylinder head 42 and a silencer 47 connected to the rear end of the exhaust pipe 46.

  A storage box 48 as a container is disposed between the left and right seat rails 22L and 22R and above the pivot plate 23. A fuel box 48 is disposed between the left and right seat rails 22L and 22R behind the storage box 48. A tank 51 is arranged. An occupant seat 67 (also referred to as “tandem seat 67”) is disposed so as to cover the storage box 48 and the fuel tank 51.

  A fuel pump 52 is built in the fuel tank 51, and a fuel hose 54 through which fuel passes is connected between the fuel pump 52 and a fuel supply device 53 that supplies an air-fuel mixture to the engine 12. The fuel supply device 53 includes a fuel injection device 53a.

Hereinafter, the vehicle body cover that covers the vehicle body frame 11 will be described.
The vehicle body cover 56 combines the front handle cover 57 and the rear handle cover 58 from the front and rear, the steering handle 14 and the handle cover 59 covering the periphery of the steering handle 14, the front of the head pipe 17 and the periphery of the headlight 61. The front cowl 62 to be covered, the main cowl 63 to cover the rear of the head pipe 17 and the upper part of the front of the main frame 21, and the front side of the driver R's legs are covered adjacent to the lower side of the front cowl 62 and the main cowl 63. Leg shields 64L and 64R (only the front side reference sign 64L is shown), a pair of left and right center covers 65L and 65R (only the front side reference sign 65L is shown) adjacent to the rear part of these leg shields 64L and 64R, and these Adjacent to the rear of the center cover 65L, 65R A pair of left and right side cowls 68L and 68R (only the front side reference 68L is shown) extending rearward and obliquely upward along the side portion of the passenger seat 67 on which the passenger and passengers sit, and lower portions of these side cowls 68L and 68R A pair of left and right under cowls 69L and 69R (only the front side reference 69L is shown), and a rear cover 71 connected to the rear ends of the side cowls 68L and 68R and surrounding the rear edge of the occupant seat 67. The member covers the vehicle from the periphery of the steering wheel 11 and from below to the rear of the occupant seat 67.

  Here, 72 is a front fender that covers the upper side of the front wheel 13, 73 is a disc brake that brakes the front wheel 13, 74 is a stand, 75L and 75R (only the reference numeral 75L is shown on the front side) is a driver step, and 76L and 76R. (Only the reference numeral 76L on the front side is shown) is a passenger step, 77 is a tail lamp, 78 is a rear fender, and 79 is a mirror shaft to which a mirror 79a is attached.

  FIG. 2 is a cross-sectional view of the main part of the saddle-ride type vehicle according to the present invention. In the motorcycle 10, seat rails 22L and 22R as constituent elements of the body frame 11 (only the reference numeral 22L on the front side is shown. The same applies hereinafter). ) In the middle portion of the fuel tank 51 through seat brackets 81L and 81R (only the front side reference numeral 81L is shown. The same applies hereinafter) and fastening members 82... The front part of the fuel tank 51 is attached to the rear part of the seat rails 22L and 22R, and a storage box 48 as a container is disposed in front of the fuel tank 51, and fuel is supplied from the storage box 48 to the fuel. A passenger seat 67 is provided over the rear of the tank 51 so as to be rotatable about the hinge shaft 83, and is attached to the bottom plate 67 s of the passenger seat 67 and the fuel tank 51. Between the pump 52, the fuel pump cover 84 is disposed. That is, the fuel pump cover 84 is provided below the occupant seat 67, and the fuel tank 51 is provided below the fuel pump cover 84.

  The fuel pump 52 is a member that is attached to the fuel tank 51 from above and supplies fuel to an engine (see reference numeral 12 in FIG. 1) as an internal combustion engine (see reference numeral 120 in FIG. 1). Are connected by a fuel hose 54.

The fuel pump cover 84 is a member provided between the fuel pump 52 and the passenger seat 67.
In the figure, 85 is a cap that allows the fuel inlet of the fuel tank 51 to be opened and closed, and 86 is a rubber that is provided between the bottom plate 67 s and the fuel tank 51 and supports the passenger seat 67.

  FIG. 3 is an exploded perspective view of the fuel pump tank mounting structure according to the present invention. The fuel pump tank mounting structure 110 is provided with a recess 111 in the upper part of a fuel tank 51 for storing fuel, and a bottom surface 111a of the recess 111. A pump mounting hole 112 is provided, and the fuel pump 52 is mounted in the pump mounting hole 112 as shown by an arrow A in the figure.

  The fuel tank 51 is a combination of the upper half 114 and the lower half 115, and is formed by abutting and joining the flange 114 f of the upper half 114 and the flange 115 f of the lower half 115. When the joint between the flange 114f and the flange 115f is a flange joint 116, a fastening member (reference numeral 82 in FIG. 2) is fastened between the flange joint 116 and the seat rail (reference numerals 22L and 22R in FIG. 2). Fastening holes 117 through which ... are passed are opened. A fuel injection hole 118 can be opened and closed by a cap (reference numeral 85 in FIG. 2).

The fuel pump 52 is provided with a small-diameter portion 121 having a cylindrical shape in which a pump motor is incorporated, and a flange portion 122 that faces the concave portion 111 of the fuel tank 51 and engages with the fuel tank 51 above the small-diameter portion 121. A head portion 123 is provided on the upper surface 122a of the flange portion 122, a fuel discharge portion 124 and a connector connecting portion 125 are provided on the head portion 123, and flange foot portions 127. Has been extended. Reference numeral 131 denotes a seal member.
A filter member 132 for filtering foreign matter contained in the fuel is attached to the lower end of the small diameter portion 121.

  FIG. 4 is an exploded perspective view for explaining the structure of the engaging portion provided in the tank mounting structure of the fuel pump according to the present invention. The pump mounting hole 112 in which the fuel pump 52 is formed in the bottom surface 111 a of the recess 111 of the fuel tank 51. The fuel pump 52 is inserted, the flange portion 122 provided on the upper portion of the fuel pump 52 faces the recess 111, and the centering enlarged diameter portion 134 of the fuel pump 52 formed on the lower side surface of the flange portion 122 is A plurality of claws 137... And flanges having a stepped surface 136... That is aligned with the pump mounting hole 112 and below the centering enlarged diameter portion 134 below the upper surface 134 u of the centering enlarged diameter portion 134. The upper part of the fuel tank 51 is sandwiched between the feet 127. In the figure, the head of the fuel pump 52 is omitted.

FIG. 5 is a plan view for explaining a fuel pump tank mounting structure, and FIG. 6 is a sectional view taken along line 6-6 of FIG. Hereinafter, description will be made with reference to FIGS.
The fuel pump 52 is provided with a flange portion 122 provided at an upper portion and partially accommodated in the recess 111, and a seal member provided on a side surface 122 s below the flange portion 122 so as to extend in parallel with the flange portion 122. A seal seat 139 that supports 131, a centering enlarged diameter portion 134 that is formed so as to extend to a side surface 122s below the flange portion 122, and aligns the fuel pump 52 with the center of the pump mounting hole 112, and A groove portion 141 formed between the centering enlarged diameter portion 134 and the seal seat portion 139 to allow the fuel pump 52 to move when the fuel pump 52 is attached and detached, and one side surface 134Sa of the centering enlarged diameter portion 134 and the opposite side thereof. Provided below the side surface 134Sb, engages with the edge 112f of the pump mounting hole 112, and the upper surface 134 of the centering enlarged diameter portion 134. Are provided at the top of the flange portion 122 and the upper portion of the fuel tank 51 is sandwiched between the stepped surfaces 136... Flange feet 127 to be provided.

  Four flange leg portions 127 are arranged. The front ends of these flange feet 127... Are brought into contact with the upper surface 51 u of the fuel tank 51, and the back surface of the bottom surface 111 a provided with the stepped surfaces 136. The top surface 51u of the fuel tank 51 and the bottom back surface 111b are sandwiched between the tip portions of the flange feet 127... And the stepped surfaces 136.

  The seal member 131 is provided on the upper surface 139u of the seal seat portion 139 between the side surface 111s of the recess 111 and the side surface 122s provided below the flange portion 122 of the fuel pump 52, and the pump mounting hole side surface 111s and the fuel pump. 52 is a member for sealing between 52.

  The seal member 131 is formed in a substantially U shape with a cross section opened downward. If the seal member 131 is an O-ring having a circular cross section, there is a limit to the crushing allowance of the O-ring, and it is difficult to compress and deform the seal member during attachment, removal, and centering, which affects workability.

  In this regard, if the seal member 131 has a U-shaped cross section that opens downward, the crushing allowance can be sufficiently taken, the compression deformation is facilitated, and workability is improved when the fuel pump 52 is attached, removed, or centered.

  In addition, as compared with the case where the cross section of the seal member 131 is not formed in a substantially U shape opened downward, the seal member 131 can be elastic in the left-right direction. If it does so, when centering the fuel pump 52 at the time of attachment and detachment of the fuel pump 52, the required elasticity can be easily secured.

The operation of the fuel pump tank mounting structure described above will be described next.
FIG. 7 is an operation explanatory view of the fuel pump tank mounting structure according to the present invention (after inserting the lower part of the fuel pump into the pump mounting hole, the fuel pump groove portion faces the edge of the pump mounting hole and Until the pump is pressed.)

In (a), when the fuel pump 52 is attached to the fuel tank 51, the lower part of the fuel pump 52 is inserted into the pump attachment hole 112.
In (b), the fuel pump 52 is moved in the direction of the arrow b so that the groove portion 141 provided above the centering enlarged diameter portion 134 formed in the fuel pump 52 faces the edge 112f of the pump mounting hole 112.
In (c), the fuel pump 52 is pressed in the direction of the arrow m from above in the state of (b).

FIG. 8 is an operation explanatory view of the fuel pump tank mounting structure according to the present invention (after pressing the fuel pump from above until mounting is completed).
5A, in the state where the fuel pump 52 is pressed in the direction of the arrow m, one side surface (reference numeral 134Sa in FIG. 5) of the centering enlarged diameter portion 134 and the opposite side surface (FIG. 5, stepped surfaces 136... That are one step lower than the upper surface 134u of the centering enlarged diameter portion 134, which are provided at the tips of the plurality of claw portions 137.

  In (b), the pressure from above on the fuel pump 52 is released. Then, the fuel pump 52 is biased upward while being accurately aligned by the elastic force of the seal member 131, the centering enlarged diameter portion 134, the claw portion 137..., And the flange foot portion 127.・ ・ It can be pressed from above. That is, the fuel pump 52 is clamped by the stepped surfaces 136... And the flange feet 127.

  Further, when removing the fuel pump 52 from the fuel tank 51, the work may be performed in the reverse order. Specifically, the fuel pump 52 is pressed from above, and the engagement between the edge 112f of the pump mounting hole 112 and the stepped surface 136.

Next, with the fuel pump 52 pressed, the fuel pump 52 is moved in a direction parallel to the claw portions 137..., And from the edge 112 f of the pump mounting hole 112, one side surface 134Sa or the opposite side surface 134Sb. Remove the claw portions 137.
Finally, the claw portions 137... Provided on the remaining side surface are removed and the fuel tank 51 is lifted to complete the removal.

  As described above, according to the fuel pump tank mounting structure of the present invention, it is possible to maintain good detachability of the fuel pump 52 without increasing the number of parts. That is, the cost can be reduced while maintaining good detachability of the fuel pump unit.

Referring also to FIG. 5, the plurality of claw portions 137... Extend in parallel in one direction, and the side surfaces 137 s... Of the claw portions 137. It is provided in parallel with. If the side surfaces 137 s of the claw portions are provided in parallel to the axial direction of the pump mounting hole 112, the plurality of claw portions 137. Can be attached and detached smoothly.
In addition, it is possible to smoothly attach and detach the claw portions 137 to the pump mounting hole 112 while securing an area necessary for the engagement of the fuel pump 52.

  Although the present invention is applied to a motorcycle in the embodiment, it can also be applied to a tricycle and can be applied to a general vehicle.

In claim 1, the sealing member may not be formed in a substantially U shape whose cross section is opened downward. That is, the cross-sectional shape of the seal member can be set arbitrarily.
In the second aspect, the plurality of claw portions may not extend in parallel with one direction, and the direction in which the claw portions extend is arbitrary as long as the claw portions can be attached and detached.

  The present invention is suitable for a tank mounting structure for a fuel pump provided in a motorcycle.

1 is a side view of a motorcycle according to the present invention. It is principal part sectional drawing of the saddle-riding type vehicle which concerns on this invention. It is a disassembled perspective view of the tank mounting structure of the fuel pump which concerns on this invention. It is a disassembled perspective view explaining the structure of the engaging part provided in the tank mounting structure of the fuel pump which concerns on this invention. It is a top view explaining the tank mounting structure of a fuel pump. 6 is a cross-sectional view taken along line 6-6 of FIG. Operation explanatory diagram of fuel pump tank mounting structure according to the present invention (After inserting the lower part of the fuel pump into the pump mounting hole, pressing the fuel pump from above with the groove of the fuel pump facing the edge of the pump mounting hole Until you do that.) It is action explanatory drawing of the tank mounting structure of the fuel pump which concerns on this invention (After pressing a fuel pump from upper direction until mounting is completed).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 51 ... Fuel tank, 52 ... Fuel pump, 52s ... Side surface of fuel pump, 110 ... Tank mounting structure of fuel pump, 111 ... Recess, 111a ... Bottom surface of recess, 111s ... Side surface of recess, 112 ... Pump mounting hole, 112f ... Edge of pump mounting hole, 122 ... flange portion, 122s ... lower side surface of flange portion, 127 ... flange foot portion, 131 ... sealing member, 134 ... centering enlarged diameter portion, 134Sa ... one side surface of centering enlarged diameter portion, 134Sb ... Side surface on the opposite side of the centering enlarged diameter portion, 136 ... Stepped surface, 137 ... Claw portion, 137 s ... Side surface of the claw portion, 139 ... Seal seat portion, 139 u ... Upper surface of the seal seat portion.

Claims (3)

A recess is provided in the upper part of the fuel tank for storing fuel, and a pump mounting hole is provided in the bottom surface of the recess. A fuel pump is inserted into the pump mounting hole, and the fuel pump is attached to the fuel tank. In the tank mounting structure,
The fuel pump is provided with a flange portion partly accommodated in the recess at the upper part,
A seal seat portion that supports the seal member is provided on the side surface below the flange portion in parallel with the flange portion,
On the upper surface of the seal seat, the seal member is provided between the side surface of the recess and the side surface of the fuel pump,
A centering enlarged diameter portion for aligning the fuel pump with the center of the pump mounting hole is formed on the lower side surface of the flange portion,
A plurality of claws having a stepped surface that engages with the edge of the pump mounting hole and is one step lower than the upper surface of the centering enlarged diameter portion are provided below one side surface of the centering enlarged diameter portion and the opposite side surface. And
A tank mounting structure for a fuel pump, wherein a flange foot for sandwiching the upper portion of the fuel tank between the stepped surface and the flange portion is provided at the upper portion of the flange portion.   2. The fuel pump tank mounting structure according to claim 1, wherein the seal member is formed in a substantially U shape with a cross section opened downward. 3.   The plurality of claw portions are all extended in parallel in one direction, and the side surfaces of the claw portions are provided in parallel with the axial direction of the pump mounting hole. The fuel pump tank mounting structure described.

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